iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-12-17T21:07:12Z. The update package is 404 MB. This is a delta (partial) update that requires 12.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3730a44acbaac91c4004b2aca79fe879c2b969b8.zip.